{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-18756 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-18756 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-18756 is a high-severity cross-site scripting vulnerability in HumHub, published on 19 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-18756 and fix it if it is affected.\n\nWhat it is: CVE-2026-18756 is a high-severity cross-site scripting vulnerability in HumHub, published on 19 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-18756 in the wild and no public exploit code.\n\nAffected product: HumHub. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-18756/ (Markdown: https://insights.sbomify.com/CVE-2026-18756/index.md)","id":"CVE-2026-18756","markdown":"https://insights.sbomify.com/CVE-2026-18756/index.md","name":"CVE-2026-18756","record":{"aliases":[],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["code_execution","account_takeover"],"network_reachable":"yes","non_default_config":false,"product_category":"HumHub Community Edition","requires_auth":"low_privilege","summary":"Attackers can inject JavaScript via query parameters in HumHub's membership request form, potentially hijacking user sessions or executing code.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Fluid Attacks","cpe":[],"cvss":{"score":7.2,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N","version":"4.0"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"HumHub Community Edition 1.18.4 contains a reflected cross-site scripting vulnerability in the Space membership-request workflow. An attacker can place attacker-controlled button configuration in the options query-string parameter of space/membership/request-membership-form, lure an authenticated non-member into submitting the legitimate membership request form, and cause the server to return JavaScript containing attacker-controlled code.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"HumHub Community Edition 1.18.4-pl1 - Reflected XSS in Space membership request button rendering","id":"CVE-2026-18756","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"xss","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"An improper authentication and path traversal vulnerability exists in ASUSTOR Backup Plan and ASUSTOR EZ Sync.","id":"CVE-2026-18759"},"packages":[],"prev":{"headline":"GV-ASManager DLL hijacking vulnerability","id":"CVE-2026-18755"},"products":["HumHub"],"published":"2026-08-19","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-08-21","vendors":["HumHub"]},"summary":"Attackers can inject JavaScript via query parameters in HumHub's membership request form, potentially hijacking user sessions or executing code.","url":"https://insights.sbomify.com/CVE-2026-18756/"}